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STM32H7A3 External Crystal

Joseph.Paul
Associate II

can we use internal 24MHz clock for STM32H7A3VIH6Q host or we should use external? Maybe in the future we are going to use USB. Now, just UART and SPI, should I use external to support USB in the future?

1 REPLY 1
AScha.3
Chief III

For better precision (and low jitter) use external crystal. USB anyway needs it .

I recommend an oscillator (i use also) , no trouble with caps etc. ; today not much more expensive than a crystal and the caps.

And a damping resistor (51r) in the clock line, to avoid ringing.

Something like this: 520-2520MV-160-CNT

https://www.mouser.de/ProductDetail/ECS/ECS-2520MV-160-CN-TR?qs=byeeYqUIh0MIhToPrW09tg%3D%3D

AScha3_0-1714585597830.png

or if you want 24 M  : 520-2520MV-240-BN-T

 

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